Patent GB-190619921-A (GB)
Title: Improvements in Loom Dobbies.
Inventor: HAWORTH THOMAS
Filed: 1906-09-07
Granted: 1907-02-14
Abstract: 19,921. Haworth, T., Briggs, J., and Ayrey, W., [trading as Eachill Dobby Co.]. Sept. 7. Loom dobbies.-The jack levers 1, 2, Fig. 1, are mounted in pairs on rods 5, 6, and are acted upon by rods 7, provided with cross-pieces 8 and with tail-pieces 9 entering grooves in the jack levers. The rods 7 enter recesses 10 in horizontal balk levers 11, which are provided with grooves for side fins 12. The balk levers are forced against side brackets 13, and have recesses in which are seated the curved or rounded bases 19 of draw-bars 14 provided with fins 20 and lips 21. The upper ends 15 of the draw-bars are acted on by feelers 22, 23. When the latter are pushed inwards by pegs on the pattern barrels, the draw-bars are liberated so that their hooked ends fall into position to be acted upon by the draw-knives 25. The balk levers 11 and rods 7 are thereby depressed, and the healds are lifted. There are two pattern cylinders, one of which is the cross-border cylinder operating the feelers 22, while the other, which is shown in action, operates the feelers 23 and corresponding draw-bars and serves for the body of the fabric. Grates 26 separate the feelers, and grates 27 separate the draw-bars. The two pattern cylinders are mounted in a slide frame 28. Fig. 2, which is moved in one direction or the other in accordance with pattern indications on a third cylinder 33. This cylinder is turned at intervals when a special peg on the pattern surface of either of the other cylinders comes into operation and operates an extra jack lever (not shown), this jack lever being provided with a pivoted pawl or catch which gives a turn to the extent of one tooth to the cylinder 33. The cross-border cylinder is in action when a peg comes up on the cylinder 33. If a peg comes up on this cylinder again, the cross-border cylinder goes round again, but if a blank is presented, a feeler 36 falls, a vertical rod 38 is raised, and a lever 39 provided with studs 40, 41 is rocked. The stud 40 raises the driving pawl or catch 42 clear of the cross-border cylinder, and the stud 41 allows the pawl 43 to fall into gear with the ratchet-wheel of the other pattern cylinder. At the same time, a small catch 46 is raised, and a similar catch 45 lowered, so that a catch-plate 48 engages the latter and slides the sliding frame to the right, bringing the lastmentioned cylinder into operation. The catches 45, 46 are hung by wire links or chains from the rocking lever 39, and the catch-plate 48 is oscillated by a lever 49 fixed to a shaft 50. Rods 51, 52, connected adjustably to aT-lever, actuate the dobby knives 53, which slide in slots in the dobby frame and are provided with pins or studs, on which aie mounted small cylindrical carriers 55 provided with lugs 56 and tapped to fit in the ends of the rods, retaining-nuts 58 being used. The T- lever is linked to an L-lever 59 actuated by the usual dobby rod, which is oscillated by a small quadrant provided with a curved slot for the stud of the dobby rod. By varying the position of the stud, it is stated that more or less time may be given to the motion of the dobby. The shaft 50 extends across the dobby, and is fitted with similar connexions to the dobby knives at the front to those already described at the back of the dobby. The slide frame has also attached thereto a rocking lever provided with two recesses. A catch springs into one of the recesses after each reversal of the slide frame and change of cylinders.